Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Patent
1991-09-30
1994-03-29
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
528497, 528502, 560352, C08F 600, C08F 610
Patent
active
052984311
ABSTRACT:
This invention relates to a multi-step process for isolating a cyclotrimerized isocyanate from mixture containing said cyclotrimerized isocyanate plus an isocyanate oligomer which comprises the steps of: (a) contacting said mixture with a liquid solvent to provide a solvent-containing mixture, (b) extracting said solvent-containing mixture by liquid-liquid extraction to cause said solvent-containing mixture to elute into an extractate and a residue, wherein said extractate is a cyclotrimerized isocyanate that is essentially oligomer-free and is further characterized by having reduced viscosity relative to said solvent-containing mixture, and (c) separating uncyclotrimerized monomer from said extractate to provide a reduced viscosity trimer product that is essentially free of monomer. Also disclosed is the reduced-viscosity product produced by this process.
REFERENCES:
patent: 4220728 (1980-09-01), Kresta et al.
patent: 4265798 (1981-05-01), Mishra
patent: 4324879 (1982-04-01), Bock et al.
patent: 4412073 (1983-10-01), Robin
patent: 4876380 (1989-10-01), Chen et al.
patent: 4963675 (1990-10-01), Robin et al.
Barsa Edward A.
Goldstein Stephen L.
Carlson Dale L.
Kight III John
Olin Corporation
Troung Duc
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